package com.sky.aspect;

import com.sky.anno.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/*
* 自定义切面，实现公共字段自动填充*/
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /*
    * 切入点*/
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.anno.AutoFill)")
    public void autoFillPointCut(){}

    /*
    * 前置通知，在通知中进行公共字段的赋值*/
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        log.info("开始进行公共字段的自动填充...");
        //获取到当前被拦截的方法上的数据库操作类型
        MethodSignature signature =(MethodSignature) joinPoint.getSignature();//方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得方法上的注解
        OperationType operationType = autoFill.value();//获得数据库操作类型
        //获取到当前被拦截的方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if(args==null||args.length==0){
            return;
        }

        Object entity = args[0];
        //准备数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        Class<?> clazz = entity.getClass();
        Method setUpdateTime = clazz.getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
        Method setUpdateUser = clazz.getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
        //根据不同的操作类型为对应的属性赋值
        if(operationType==OperationType.INSERT){
            //为四个公共字段赋值
            Method setCreateTime = clazz.getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
            Method setCreateUser = clazz.getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);

            //通过反射为对象属性赋值
            setCreateTime.invoke(entity,now);
            setCreateUser.invoke(entity,currentId);

        }
        //为两个公共字段赋值
        setUpdateTime.invoke(entity,now);
        setUpdateUser.invoke(entity,currentId);

    }
}
